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Ndfeb magnet production process _ ndfeb strong magnet manufacturers

by:Newland     2020-04-02
Ndfeb magnet production process & ensp; Production technology of nd-fe-b alloy mainly include powder metallurgy process, fast melt quenching process, hydrogenated ( HDDR) Process and bonding process.   1. Powder metallurgy process. This is one of the most common application, the main production of sintered magnets. Its technological process is: after the alloy in vacuum induction furnace melting cast ingot, less than 5 mm and then broken into pieces, and after in the protection of grinding medium ( Such as the jet mill or vibration ball mill, etc. ) Made from 3 ~ 5 & mu; Magnetic field of 5 t press forging billet, and finally in sintering furnace for sintering and the heat treatment under argon protection. Sintering temperature about 1100 ℃, the heat preservation and 1 h, then in the argon gas quenching cooling to room temperature, then rose to 900 ~ 600 ℃ tempering treatment. After sintered magnets has been grinding or edm into a certain shape, after magnetization, test can be used as components.   2. The melt quenching process. The main production faster quenching magnets. Specific process is: the ndfeb alloy solution will melt in a vacuum or argon gas injection in a high-speed rotation of the surface of the water cooling TongGun, it at about 106 ℃ / s cold speed cooling as the state of the amorphous or microcrystalline thin tape ( A scaly) , thin belt grinding into powder and then after 650 ℃ or so get a quick quenching heat treatment can be magnetic powder, American general motors company called MQ magnetic powder. The magnetic powder mixes with resin binder such as press forming shape, become namely after drying curing MQ1 magnets. The MQ magnetic powder, within the range 650 ~ 750 ℃ with a certain pressure forming a relative density of 100% isotropic that chunk of permanent magnets, hot-pressing magnets ( MQ2 magnet) , if extrusion magnet through hot compressive deformation or hot extrusion processing, due to the grain produced in the process of the thermal deformation caused by the rheological preferred orientation, the resulting large anisotropic permanent magnet said thermal deformation magnet ( MQ3 magnets) 。   3. Hydrogenated ( HDDR) Process. Main production HDDR magnetic powder. Concrete process is: ndfeb alloy ingot ( About 3 ~ 5 mm size) Placed in airtight vacuum pressure container, and then to fill the container 105 pa hydrogen, then the container heating to 750 ~ 850 ℃ heat preservation 2 h make alloy disproportionation, then under the temperature will let machine vacuum about 1 h, namely the dehydrogenation and then cooled to room temperature to complete the restructuring process. Specific equation for & ensp; Nd2Fel4B+2.7H2- - - - - - - - - - - - - - - - - - -> Nd2Fel4BH2。 9 ( Hydrogen absorption process)   Nd2Fel4BH2。 9 - - - - - - - - - - - - - - - - - - -> Very fine Fe, NdH2. 2, Fe2B and mixed structure (Nd2Fel4B Disproportionation process)   Very fine Fe, NdH2. 2, Fe2B hybrid structure generated Nd2Fel4B crystal nucleus ( The dehydrogenation process)   From crystal nucleus grow Nd2Fel4B fine grained ndfeb alloy ( 3 & mu; m) ( Restructuring process)   3 & mu; M smaller than a grain of sintered magnets, close to the alloy single domain size, has the high coercive force. Each grain powder particles containing several small main phase, has no orientation, so the powder for isotropic powder. Add the appropriate elements such as aluminum, gallium, zirconium and hafnium of multivariate ndfeb alloy, using HDDR process, can make in large particles of powder of fine grain preferred orientation, and the anisotropy of powder can be obtained. With HDDR of powder can be made into isotropic and anisotropic bonded magnet, bonded magnet performance see rare earth permanent magnetic alloys
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